Boost knob on the GK800RB

I've got a GK 800rb but the boost knob seems to hardly make any difference at all. Whether the boost is on full, rolled back or turned off completely, it all sounds the same. Is it quite a 'tame' change to the sound or should I definitely be hearing something? Thanks in advance folks

Hi There,
You should certainly be able to hear a bump in volume. Check to see if the green light next to the boost knob (red light on older models?) is lit. If not you will need to use a footswitch (any single function pedal should work) to turn the boost on/ off. This has actually been a request on some of the newer RB series heads to have the boost footswitchable. Hope this helps,
Brent

How do you set the gain knob on your 800rb?
The boost depends on the gain setting. The higher the gain, the more effective is the boost knob.
For my passive basses, I set the gain at ~1 hrs on my 1st series 400rb. The influence of the boost is huge: it first adds more volume (lots of it), and at ~1 hrs is where that famous GK growl kicks in.

How do you set the gain knob on your 800rb?
The boost depends on the gain setting. The higher the gain, the more effective is the boost knob.
For my passive basses, I set the gain at ~1 hrs on my 1st series 400rb. The influence of the boost is huge: it first adds more volume (lots of it), and at ~1 hrs is where that famous GK growl kicks in.

Click to expand...

This ^^

Run your input up to a good noon - 1:00 and the boost will come alive. Then use the Master to set overall volume level. These are one of few solidstate amps that sound good when you crank them. If you find yourself in a situation where it's volume appropriate to run the master up to 3:00 or so on top of all that it gets extra fun. I've been using my 400rb on more and more smaller gigs so I can do just that. But, the 800 too will get you that sound at appropriate volume if you set the input higher. Use the master as the volume knob.

Sorry for the delay in getting back to you guys. Thanks very much for this, I keep my volume on full and turn use the gain as a 'volume', so I'll try it the other way round tonight. Never thought of trying it the other way if I'm honest!

Sorry for the delay in getting back to you guys. Thanks very much for this, I keep my volume on full and turn use the gain as a 'volume', so I'll try it the other way round tonight. Never thought of trying it the other way if I'm honest!

I have a 1001 and admittedly it has a much higher wattage rating. I've never had this head past 11 o clock on the input, master and boost. Running padded I'm still wailing on two 120w tube guitar heads in the mix with an 8ohm cab.

I love the boost function when used in conjunction with the Contour. I set my contour and presence really hot (around 2 o clock) with the 5 string setting and I find that the boost really pulls out the hair on the low mids when run between 10 oclock and 11.

Anyways, I tried it the other way round, gain on 3-oclock, boost on full and using master volume as...well, volume! First impressons was that it was a lot bassier doing it this way and just felt a bit thicker i sound. Overall, liked it very much...thanks for the tips folks.